No module named sympy

[glenn-jocher]

When I try to run:

onnxslim OnnxSlim yolov8n.onnx

Traceback (most recent call last):
  File "/Users/glennjocher/PycharmProjects/OnnxSlim/venv/bin/onnxslim", line 33, in <module>
    sys.exit(load_entry_point('onnxslim', 'console_scripts', 'onnxslim')())
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/glennjocher/PycharmProjects/OnnxSlim/onnxslim/cli/_main.py", line 281, in main
    slim(
  File "/Users/glennjocher/PycharmProjects/OnnxSlim/onnxslim/cli/_main.py", line 62, in slim
    from onnxslim.core.slim import (
  File "/Users/glennjocher/PycharmProjects/OnnxSlim/onnxslim/core/slim.py", line 23, in <module>
    from .symbolic_shape_infer import SymbolicShapeInference
  File "/Users/glennjocher/PycharmProjects/OnnxSlim/onnxslim/core/symbolic_shape_infer.py", line 10, in <module>
    import sympy
ModuleNotFoundError: No module named 'sympy'